Astral Abraxas wrote:I didn't know you could use の with time. I suppose a day can possess a specific time,

の isn't a possessive. That is one of those classic "lies to children" you are told in the beginning of your studies. Eventually, you need to break away from thinking of it strictly in those terms.

の links nouns/clauses with other nouns/phrases. Whatever comes before の modifies what follows it. English does the same with prepositions. Nouns that are linked very frequently tend to become compound nouns.

"The top of the table." "Table top" 「テーブル の 上」

In English, we wouldn't say the table "possesses" a top. It's merely describes a specific aspect of the table, so you know exactly what we're focused on. の functions the same.

That explanation seems fine -- I would just add that sometimes it does show possession, that's just not it's only function. (Some people try to interpret every use of の as an extension of "possession" but I don't see the point of this. It seems like just doing needless mental gymnastics to hold on to an incorrect understanding of the particle, plus it can lead to misunderstandings, especially with things like 日本人の友達.) Usually the core meaning I try to use is that XのY means that Y is described in some way by X.